What are your detailed steps to install deepin?

i follow all steps exactly as described. but it keep giving me that error, i tried in simple and advance mod but it want select the freespce(40G)

i watched many youtube videos and followed all steps

some gif photos to show the problem

In the screenshot you are in advanced mode. In this mode after select free space you have to create 2 partitions (sytem partition and swap) format the first in ext4, the second in swap-linux and then define the mount point of the first partition as /.
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Dans les captures tu es en mode avancé. après avoir sélectionné espace libre il faut y créer 2 partitions. une pour le système de fichier et une pour le swap.
Formater la 1ère en ext4 la 2ème en swap-linux enfin définir le point de montage de la partition système en partition racine (/).

it want do that

It keep giving me that error

In fact you have already 4 primary partitions you can't add another one.
You have to save your data, remove a partition and create an expanded partition.
In the expanded partition create an ntfs partition, restore your data and then create 2 others partitions in this expanded partition, one with ext4 file system for deepin and the odher for the swap.

Edited by alh54 at 2018-3-7 04:43

You should have some thing like this for more than 4 partitions in an msdos partition table .